*{
    margin: 0;
    padding: 0;
    outline: none;
}
body{
    font-size: 14px;
    background-color: lavender;
}
ul{
    list-style-type: none;
}
#banner_wrap{
    width: 520px;
    height: 280px;
    border:solid 1px black;
    overflow: hidden;
    margin: 0 auto;
    position: relative;
}
.banner{
    width: 3850px;
    position: relative;
    left: -520px;
   /* transition: all 1s linear;*/
}
.banner img{
    float: left;
}
span{
    background-color: yellow;
    position: absolute;
    top:135px;
}
.prev{
    left: 0px;
}
.next{
    right: 0px;
}
.circle{
    position: absolute;
    bottom: 10px;
    left: 35%;
}
.circle li{
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background-color: white;
    float: left;
    margin-right: 10px;
}
.circle li.active{
    background-color: red;
}